/*
 * Copyright (c) 2003-2009,2015 KNOPFLERFISH project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * - Neither the name of the KNOPFLERFISH project nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.knopflerfish.bundle.http;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

public class ResponseWrapper
  extends HttpServletResponseWrapper
  implements Response
{
  // private fields
  private PrintWriter pw = null;
  private ServletOutputStream sos = null;

  // constructors
  public ResponseWrapper(final HttpServletResponse response)
  {
    super(response);
  }

  private HttpServletResponse _getHttpServletResponse()
  {
    return (HttpServletResponse) super.getResponse();
  }

  // implements Response
  public OutputStream getRawOutputStream()
  {
    final HttpServletResponse response = _getHttpServletResponse();

    if (response instanceof Response) {
      return ((Response) response).getRawOutputStream();
    }
    return null;
  }

  public void copy(InputStream is) {
    // Do nothing
  }

  // override ServletResponse methods
  @Override
  public ServletOutputStream getOutputStream()
      throws IOException
  {
    if (pw != null) {
      throw new IllegalStateException("getWriter() already called");
    }

    if (sos == null) {
      final OutputStream os = getRawOutputStream();
      if (os == null) {
        sos = _getHttpServletResponse().getOutputStream();
      } else {
        sos = new ServletOutputStreamImpl(os);
      }
    }

    return sos;
  }

  @Override
  public PrintWriter getWriter()
      throws IOException
  {
    if (sos != null) {
      throw new IllegalStateException("getOutputStream() already called");
    }

    if (pw == null) {
      final OutputStream os = getRawOutputStream();
      if (os == null) {
        pw = _getHttpServletResponse().getWriter();
      } else {
        pw =
          new PrintWriter(new OutputStreamWriter(os, getCharacterEncoding()));
      }
    }

    return pw;
  }
  
  
} // ResponseWrapper
